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s M. DIMOCK. I Machine for Casting Bobbins. No. 160,008;PtentedFeb.23,1875.

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M. D I M0 6 K. Machine for Casting Bobbins. No. 160,008 I I P atented Feb. 23, 187 5.

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. INVENJTOB.

MARTIAL DIMOCK, OF NEWARK, NEWV JERSEY, ASSIGNOR TO THE CLARK THREADGOHPANY, OF SAME PLACE.

IMPROVEMENT lN MACHINES FOR CASTING BOBBlNS.

Specification formirg part of Letters Patent No. 60,008, dated February23, 1875; application fied November 28, 1873.

To all whom it may concern:

Be it known that ,I, MARTIAL DIMOOK, of the city of Newark, county ofEssex and State of New Jersey, have invented certain Improvements inMachinery for Oastin g Bobbins, of which the following is aspecification:

This invention pertains to certain improvements in machinery for castingbobbins for sewing-machines, by which they may be formed with greatrapidity complete at one operation, and without the expense of beingfinished afterward, as is now the case in the construction of sucharticles.

The improvements are hereinafter fully described and specificallyclaimed.

In the drawings, Figure 1 represents a side elevation of the machinecomplete for forming said bobbins. Fig. 2 is a front elevation of thesame. Fig. 3 is a top view or plan. Fig. 4 is a partial elevation of theopposite side from Fig. 1. Fig. 5 is a full-size view of the mold insection, through the axis of the bobbin, which is shown also in section,and with the sprue attached. Fig. 6 is a sectional view of the mold at aright angle to Fig. 5. Fig. 7 represents the bobbin complete, havingcenters for holding it in working position in the shuttle.

The bobbin, as shown at Fig. 7, is formed of any compound of the metals,as the wellknown composition called type-metal, or any similarcombination that will melt at a low temperature, by which it may bereadily cast in metal molds, and when so cast will have a smooth surfaceand be sufficiently hard to endure the operation of having the threadwound upon it, and also sustain the work in the shuttle of thesewing-machine.

To facilitate the labor of casting such articles a combination of themold for casting the bobbin is made with the well-known appara tus forcasting type, and therefore will be readily understood by a reference tothe drawings, in which is shown a furnace, as at A, holding a tank, B,for melting the composition, and at O is shown the stem of the injectoror pump for forcing the metal into the mold. Said injector is raisedagainst its reactive springs by a lever at D, which is actuated by a camat E upon the dri\"ing-aXis F of the machine upon one end of which axisor shaft is a fly-wheehF and on the opposite end a crank, as at F forgiving motion to all the working parts of the machine. Upon a suitableframe, as at G, is mounted the mold H, said mold being formed in fourparts, as best shown at Figs. 5 and 6, where the sides and edges areshown as pivoted to a shank, H, as at h h W W. Said shank forms thesupport of the mold by being fitted into a socket in the crossheadl,which is held between the guides on the frame G in such a manner as tobe worked back and forth to and from the side of the tank or reservoirat B, and said crosshead is worked back and forth by a reciproeatinglever, as at K, one end of which is pivoted to the frame at K and theother works in a slot in the cross-head, and may terminate in afriction-roller to prevent wear in the said slot, and said lever isoperated by a cam, as at K on the main shaft, to drive the leverforward, so as to carry the mold toward the tank B, and said lever is ormay be forced back against its driving-cam by a spring, as at K 5 but itwill be found preferable to force it back by a positive motion from thesame or another eam, as the spring is not always reliable to return thecross-head, and thereby carry back the mold from the point of beingfilled. The mold, as already mentioned, being made in four parts, isheld together at the point of filling by being thrust, in its forwardmove ment, into a socket, as at M, which is attached, by adjustablebolts, to the side of the tank B, and so arranged that just as the endof the mold is carried forward to meet the nozzle from the injector thetapered end of the mold is forced into said socket M to such a degree asto hold the four parts thereof firmly together until the injector canact to fill the mold, and also until the metal can set or chill in themold to such a degree as not to change its shape if the mold be opened.

The length of time that this part of the operation is continued,relatively with a revolution of the main shaft, is determined by thelength of the are of the concentric portion of the cam at K As soon assaid cam K has forced the mold forward to the nozzle on the side of thetank a rrr on 13, a cam at N, on the main axis, depresses the lever at0, one end of which is pivoted to the frame at O, and the other restsupon the spring 0 and, by said depression, vibrates the arm P, which isfastened to the pivoted end of said lever O, and thereby vibrates thelever P, to one end of which is attached the valve-stem that opens thevalve in the tank 13 to let the metal flow into the injector, and duringwhich time the plunger of the injector is raised by the cam at E on themain axis, so that the instant the cut-off valve closes the injector isforced down by the springs R R one on the injector-stem and the otherunder the lever to which the said stem is attached, B being best seen inFigs. 2 and 4:. When the mold is filled, and is held in the socket at M,as already described, a sufficient time to let the metal set, thecross-head then draws the mold back, and, during the time of itsreceding, a rod, as at S, one end of which extends through the shankthat carries the mold, is stopped by a nut near the outer end, as at Scoming in contact with a stud on the frame, as at S and thereby causesthe cross-bar on the inner end of said rod to be driven up between thefour members of the mold, and, as a wedge, to drive them apart, andthereby free the bobbin that has just been cast therein; and here itwill be observed that the inclined sides of the mold, against which theopening bar or wedge acts, are so formed that the ends of said bar actfirst upon the edge parts of the mold to drive them off the ends of thebobbin before the sides are set free, after which a still furtherbackward action of the mold completely releases the bobbin, and, uponbreaking 011' the sprue, the bobbin is completed and ready for use. Themold being carried with one of its sides down, it is evident that, whenit is out of the socket M, said lower side would hang down to a verticalposition were it not for a stop or check lever, as shown at U, Fig. 1,which is mounted upon the cross-head, and attached to a bar under thelower member of the mold, and which, as the mold advances toward thetank to be filled, raises the said lower side by a pin in the said leverrising on an incline, as at U, and

thereby lifts said under side of the mold until it enters the socket atM. The pin in the lever U then drops through a notch in the incline, andtravels back underneath it to its first position, ready to lift thelower member whenever the bobbin is dropped therefrom. Upon the outerend of the rod S a check-nut is set on the outside of the stud, so as todraw the rod back in the mold and allow the members to close toward eachother; but, referring to Figs. 5 and 6, it will be seen that the tips orcenters of the bobbin are cast in holes or recesses in the two edgepieces of the mold, and, consequently, fins or rough edges will bethereby avoided on the said tips, and they will not require to befinished any further to be ready for the shuttle. It will also beobserved that, at one end of the bobbin, as shown in section at Fig. 5,there is a small projection, as at V, extending from the edge of themold into the end of the bobbin, and thereby forms a hole in the end,into which a pin is inserted from the winding-mandrel when the bobbinsare filled with thread.

I claim- 1. The frame G, provided with the horizontal mold H,constructed of four pivoted parts, as described, the shank of which isfitted into a socket in the cross-head I, in combination with thereciprocating lever K and the cam K on the main shaft for moving themold from and toward the tank, substantially as and for the purposedescribed.

2. In combination with the mold H, tank B, and injector G, the socket M,attached to the tank for receiving and holding the four parts of themold together while the mold is being filled, substantially as and forthe purpose described.

3. The combination, with the mold H, arranged in the frame G, of thestop or check lever U and incline U, constructed to lift the lowermember of the mold, as and for the purposes described.

MARTIAL DIMOCK.

Witnesses:

EUGENE N. ELIOT, Born ELIOT.

